drm/i915/xehpsdv: factor out function to read RP_STATE_CAP

Instead of maintaining the same if ladder in 3 different places, add a
function to read RP_STATE_CAP.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210805163647.801064-6-matthew.d.roper@intel.com

drivers/gpu/drm/i915/gt/debugfs_gt_pm.c

@@ -309,13 +309,11 @@ static int frequency_show(struct seq_file *m, void *unused)
 		int max_freq;
 
 		rp_state_limits = intel_uncore_read(uncore, GEN6_RP_STATE_LIMITS);
-		if (IS_GEN9_LP(i915)) {
-			rp_state_cap = intel_uncore_read(uncore, BXT_RP_STATE_CAP);
+		rp_state_cap = intel_rps_read_state_cap(rps);
+		if (IS_GEN9_LP(i915))
 			gt_perf_status = intel_uncore_read(uncore, BXT_GT_PERF_STATUS);
-		} else {
-			rp_state_cap = intel_uncore_read(uncore, GEN6_RP_STATE_CAP);
+		else
 			gt_perf_status = intel_uncore_read(uncore, GEN6_GT_PERF_STATUS);
-		}
 
 		/* RPSTAT1 is in the GT power well */
 		intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);

drivers/gpu/drm/i915/gt/intel_rps.c

@@ -996,20 +996,16 @@ int intel_rps_set(struct intel_rps *rps, u8 val)
 static void gen6_rps_init(struct intel_rps *rps)
 {
 	struct drm_i915_private *i915 = rps_to_i915(rps);
-	struct intel_uncore *uncore = rps_to_uncore(rps);
+	u32 rp_state_cap = intel_rps_read_state_cap(rps);
 
 	/* All of these values are in units of 50MHz */
 
 	/* static values from HW: RP0 > RP1 > RPn (min_freq) */
 	if (IS_GEN9_LP(i915)) {
-		u32 rp_state_cap = intel_uncore_read(uncore, BXT_RP_STATE_CAP);
-
 		rps->rp0_freq = (rp_state_cap >> 16) & 0xff;
 		rps->rp1_freq = (rp_state_cap >>  8) & 0xff;
 		rps->min_freq = (rp_state_cap >>  0) & 0xff;
 	} else {
-		u32 rp_state_cap = intel_uncore_read(uncore, GEN6_RP_STATE_CAP);
-
 		rps->rp0_freq = (rp_state_cap >>  0) & 0xff;
 		rps->rp1_freq = (rp_state_cap >>  8) & 0xff;
 		rps->min_freq = (rp_state_cap >> 16) & 0xff;
@@ -2140,6 +2136,17 @@ int intel_rps_set_min_frequency(struct intel_rps *rps, u32 val)
 		return set_min_freq(rps, val);
 }
 
+u32 intel_rps_read_state_cap(struct intel_rps *rps)
+{
+	struct drm_i915_private *i915 = rps_to_i915(rps);
+	struct intel_uncore *uncore = rps_to_uncore(rps);
+
+	if (IS_GEN9_LP(i915))
+		return intel_uncore_read(uncore, BXT_RP_STATE_CAP);
+	else
+		return intel_uncore_read(uncore, GEN6_RP_STATE_CAP);
+}
+
 /* External interface for intel_ips.ko */
 
 static struct drm_i915_private __rcu *ips_mchdev;

drivers/gpu/drm/i915/gt/intel_rps.h

@@ -41,6 +41,7 @@ u32 intel_rps_get_rp1_frequency(struct intel_rps *rps);
 u32 intel_rps_get_rpn_frequency(struct intel_rps *rps);
 u32 intel_rps_read_punit_req(struct intel_rps *rps);
 u32 intel_rps_read_punit_req_frequency(struct intel_rps *rps);
+u32 intel_rps_read_state_cap(struct intel_rps *rps);
 
 void gen5_rps_irq_handler(struct intel_rps *rps);
 void gen6_rps_irq_handler(struct intel_rps *rps, u32 pm_iir);

drivers/gpu/drm/i915/i915_debugfs.c

@@ -420,13 +420,11 @@ static int i915_frequency_info(struct seq_file *m, void *unused)
 		int max_freq;
 
 		rp_state_limits = intel_uncore_read(&dev_priv->uncore, GEN6_RP_STATE_LIMITS);
-		if (IS_GEN9_LP(dev_priv)) {
-			rp_state_cap = intel_uncore_read(&dev_priv->uncore, BXT_RP_STATE_CAP);
+		rp_state_cap = intel_rps_read_state_cap(rps);
+		if (IS_GEN9_LP(dev_priv))
 			gt_perf_status = intel_uncore_read(&dev_priv->uncore, BXT_GT_PERF_STATUS);
-		} else {
-			rp_state_cap = intel_uncore_read(&dev_priv->uncore, GEN6_RP_STATE_CAP);
+		else
 			gt_perf_status = intel_uncore_read(&dev_priv->uncore, GEN6_GT_PERF_STATUS);
-		}
 
 		/* RPSTAT1 is in the GT power well */
 		intel_uncore_forcewake_get(&dev_priv->uncore, FORCEWAKE_ALL);